Arthur r



A. R. MOSLER.

SPARK PLUG.

APPLICATION FILED JAN. 16,19!-

1,321,467. Patented Nov. 11, 1919.

UNITED STATES PATENT OFFICE.

ARTHUR B. MOSLER, OF NEW YORK, N. Y.

SPARK-PLUG.

Application filed January 16, 1918.

To all whom it may concern:

Be it known that I, ARTHUR R. Mosnnn, a citizen of the United States,and resident of the borough of Manhattan, in the city and State of New.York, have invented a new and useful Improvement in Spark- Plugs, ofwhich the following is a specification.

The object of my invention is to provide certain improvements in sparkplugs, whereby the parts ma be very readily assembled, the .insulatingblock being locked against removal from the shell by a locking. ring,the locking ring serving not only to secure the block within the shellbut also serving to force the block onto its seat.

A further object is to provide novel means for packing the insulatingblock.

A practical embodiment of my invention is represented in theaccompanying drawings, in which- Figurel represents my improvedjsparkplug in top plan,

Fig. 2 1s a longitudinal central section through the plug, theinsulating block and itsdelectrode being shown in side elevation, an

Fig. 3 is a cross section taken in the plane of the line IIIIII of Fig.2.

The spark plug shell 1 has a smaller bore 2 and a larger bore 3 betweenWhich is formed a fiarin seat 4:. The insulating block has reduce innerand outer ends 5, 6, and an enlarged intermediate portion 7 formin innerand outer shoulders 8, 9, the inner s oulder 8 opposite the shell seat4, being tapered. The outer shoulder 9 is also ta ered.

he outer end of the shell is provided with an interior annular groove 10having one or both of its walls 11 arranged at right angles to thelongitudinal axis of the plug. normally contracted yielding locking ring12 is partly seated in the groove 10 and is partly located within thelarger bore 3 of the shell opposite the tapered shoulder 9 of theinsulating block.

The groove 10 is sufficiently deep to permit the ring 12 to be expandedinto the same as the block is inserted into the shell.

As soon as the block is inserted sufficiently, the ring 12 will contractagainst the tapered shoulder 9 of the block and thereby force the blockonto its seat 4. A

Specification of Letters Patent.

Patented Nov. 11, 1919.

Serial No. 212,128.

soft metal gasket 13 and a spring metal washer 14 are interposed betweenthe shoulder 90f the insulating block and the locking ring 12. A softmetal gasket 15 is interposed between the shell seat 4 and theinsulating block shoulder 8. The gasket 13 is preferably made of softcopper Wire and the gasket 15 is preferably a coil of soft copper wire.In forcing the block into ositlon within the shell, the-gaskets will eflattened to secure a tight oint, which pressure is maintained by t eaction of the locking rinlg' l2.

referably a lead or other readil fusible metal wire coil 16 is insertedin t e space between the insulating block and shell, it being intendedthat this wire packing should melt at the high temperatures to which thespark plug is subjected in use and the molten metal flow into the gasket15 and combine". therewith to insure a gas-tight joint at this point.

From the above description, it will be seen that I have provided a verysimple and effective means for permanently securing the insulating blockwithin the shell and that I have provided a very effective packinbetween the block and shell.

t is evident that changes may be resorted to in the form, constructionand arrangement of the several parts without departing from the spiritand scope of my invention: hence I do not wish to limit myself strictlyto the structure herein set forth, but

What I claim is:

1. A spark plug comprising an insulating block, a shell and yieldingmeans permitting the insertion of but preventing the removal of theblock from the shell, said means serving to force the block onto -itsseat.

2. A spark plu comprising an insulating block, a shell an a yieldinglocking ring permitting the insertion but preventing the removal of theblock from the shell, said ring serving to force the block onto itsseat.

3. A spark plug comprising an insulating block, a shell and a normallycontracted yielding locking ring permitting the insertion but preventingthe removal of the block from the shell.

4. A spark plug comprising an insulating block. a shell and a normallycontracted yielding locking ring permitting the insertion but preventingthe removal of the block from the shell, said ring serving to force theblock onto its seat.

5. A spark plug comprising a shell having a seat, an insulating. blockhaving a shoulder, a soft metal gasket interposed directly between saidseat and shoulder, and a fusible metal packin interposed directlybetween the shell and block.

6. A spark plug comprising a shell having a, seat, an insulatlng blockhaving a shoulder, a soft metal gasket inter osed directly between saidseat and shou der, and yielding means interlocked with the block andshell for securing the block within the shell and forcin )it onto itsseat.

7. A spark pli lg comprising a shell having. a seat,anmsulatin blockhaving a shoulder, a soft metal gasket, interposed directly between saidseat and shoulder, a fusible in tail packin vinteri'iosed directlybetween t e shellan block, and yield ng copiel 0! this flatent may beobtained for means interlocked with the block and shell for securing theblock within the shell and forcing it onto'its seat.

8. A spark plug comprising an insulatin block havinga tapered shoulder,a she] having an internal annular recess with a wall at right angles tothe longitudinal axis of the block and a normally contracted lockingring located partly within said recess, and exertin pressure on saidtapered shoulder of the ilock to force it onto its seat.

9. A spark plug comprising a shell havis: ent a h, hnlw s h i i lslrletmta Ill)

